Manufacture of vulcanized plastic articles.



W. MANUFACTURI OF JULCMHZEG ASTIC ARTICLES. APPLicATrow mm simi I, 19:5.

Patnted June 5, 1917.

2 SHEETS-SHEET l.

ateuted June 5, MT,

2`SHEES-SHEET Z.

W. G. CHRISTOPHERSON.

amlumcwe o? VULCAMZEU PLASTIC ARTEQLES.

f'WPLHIATIGhl FILED SEPT. i915.

\ posed on'tbe insie'ie anni adheres to the tube ,A stock ,l and to the red rubber composition,

y cn A 21. -Abou't the edge of fabric Q2 i then pret 'einbi4r apply e stip oisoi't cemented peper: 1 22.. mout one-haii inch in width which acts 13, 2l and 23 of rubber Wiil become united with tbegtnbe stock since the vulcenizing compounds in tbe letter must permeate `the y,eon'tamz feces 01"' the former suliicinentiy-to` eect the union of the materiels, while the fabric covereol feces of seid strips o rubber will lbe uneii'ected end etain the normal ed ilesiveness ,ofrevv iubben lAfter cure, the fabric Wrapper is removed and tbe tube is stripped from the pole either manueily by the usuel air pressure proc-` ess, the tube being turned inside-out `after or during the stripping' operation, A. cylin firieni plug 25 is then inserted in one end of the tube,ns best shown in Fig. 8, the plug having' n. conical enel'" lequipped,with' a.

ring 26. `lie paper and. fabric seals oi' pio ytective ein then i'eniofve ion tbe v rebbe-Deities i3 Winti 23, onbetb eni'is of the u tubeenn the Here-oi i9 which was pre- `vionsly formed on the collie-i* il is lapped over the smali'cni l?, to bring seid rubber strips into register, the exposed adhesive feces of seid rubber sti-ips having; been treated prior to the overiupping operation with giochi vnlcenizing componnotsucb es sniffer oiiiei'iii. The cutis are then p'i'essei firmly togetiios and after e few minutes vul- Lcanization of tber inbber strips is eccompiisbed with resultant union of the ends ef i tbe tube. i

, The plug is removed from the tnbe Lby ioosex'iI t'ne plug, the ping then being urged' manually along the tube untiitbe ring 2601i f the end projects through the hole 27 in tlie tubeto be` snbsequentiy used foi the valve. 'The ring is then placed ovei e 'hooker othei' first extending tbe bitter with nir pressureto y l stiitionsry `support and the tubey given e i 'quick `jerk 4"which pulls tbe plug bodily ,through the nele Vund completes the opere tion Hoving tbiis iesc'iribed my invention, what l". claim enti desire to protect by Letters Yetent is:

l. 1The process of joining parte of anar ticle composed oi vulennizuble rubber, which comprises applying lnyei'sbf substantially non-vuicenimble iubber to tlie'fsui'fn-ces of tbe pai-ts to bejoined, vulcanizing said parte;y

ingseid tube, applying to said layers n vul` eani'zing agent, entir uniting seid ends by cnusingvsaicl layers to Contact with each other 'wbeieby they ere vnlcen'izeltogetber by said agent. y

3, The process ofv manufacturing inner tubes consisting of forming n rubber tube with one tiered en applying to the outside thereof the insifie` of the opposite engl layers or" substantially non-vulcanizable rubber, .vnlcenieing `seid tube, turning*- the 'vuioenizecl tube inside out, treating said layers with suiini chierici, telescoping. the smaller end of the tube inte` tbe -lare end to bring the treat/eci Myers into' register, and pressing esiti layes together.

e. 'iliie process of making'. inner tnbes con sisting oi ominge, vulceniznble `rubber tube, applying 'to the inner end Vouter sur-,

inces respectiveiy ci opposite ends thereof a, strip of ,snbstentieliy nonwulcenizeble inbbei, supplying said, sti-ips on their eX- posecl sni'eccs -Wi'tiie protective covering, vnlcenizing the tube, stripping ot" seid covering, turning seicl tube insie out, treating seid. stips-witb e vulcenizing agent, `and pressing seicl treated strips together.

5. The process of making lapped jointof two ends oi-rubber tubing which consists in 'forming the tubing of rubber' compound vuicenizeble by beat, suieoing the tivo ends about their margins interioily and enti iiorlyre'spectiveiy with rubber adapted for 'cold curing, subjecting the tubing to e' heated .vnlcenizing medium While maintaining the ends protected from ii'eet Contact with said meium, snbgectlng the surfaces adapted for colciouiing to tbe coid cure ti'entinent and itneliy bringing the surfaces intocontact and, maintaining 'the contactingsur- .feces under pressure dwing vulcenizntion.

Signed. et Detroit, Mich., this 22nd of Augest, li, 

